The Department of Defense uses the 960 - 1215 MHz band for the Joint Tactical Information Distribution System (JTIDS), the Multifunctional Information Distribution System (MIDS), and other functionally similar Tactical Link systems (termed collectively, "Link 16 Terminals"). Based on its importance for aeronautical radio-navigation and supporting systems, the Department of Transportation (DoT) also has interests in this frequency band. Rapid growth in commercial and civil aviation during the 21st century shall increase the importance of ensuring spectrum supportability for existing and new systems that enhance air traffic safety. The Department of Defense and the DoT shall work cooperatively to support National Telecommunications and Information Administration (NTIA) action to protect both Link 16 and civil/commercial aeronautical systems sharing this portion of the radio frequency (RF) spectrum. Ensuring Electromagnetic Compatibility (EMC) is the cornerstone to spectrum management and supportability, and optimal system operation. Thus, the EMC features of Link 16 systems used throughout the Department of Defense shall be certified to ensure compliance with applicable requirements and specifications.